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Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-33021

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain a use-after-free vulnerability in sixel_encoder_encode_bytes() because sixel_frame_init() stores the caller-owned pixel buffer pointer directly in frame->pixels without making a defensive copy. When a resize operation is triggered, sixel_frame_convert_to_rgb888() unconditionally frees this caller-owned buffer and replaces it with a new internal allocation, leaving the caller with a dangling pointer. Any subsequent access to the original buffer by the caller constitutes a use-after-free, confirmed by AddressSanitizer. An attacker who controls incoming frames can trigger this bug repeatedly and predictably, resulting in a reliable crash with potential for code execution. This issue has been fixed in version 1.8.7-r1.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 4.6%

CVSS Severity

CVSS v3 Score 7.3

References

Products affected by CVE-2026-33021

Saitoha » Libsixel » Version: 0.11.0

cpe:2.3:a:saitoha:libsixel:0.11.0
Saitoha » Libsixel » Version: 0.12.0

cpe:2.3:a:saitoha:libsixel:0.12.0
Saitoha » Libsixel » Version: 0.14.0

cpe:2.3:a:saitoha:libsixel:0.14.0
Saitoha » Libsixel » Version: 0.15.0

cpe:2.3:a:saitoha:libsixel:0.15.0
Saitoha » Libsixel » Version: 0.16.0

cpe:2.3:a:saitoha:libsixel:0.16.0
Saitoha » Libsixel » Version: 0.16.1

cpe:2.3:a:saitoha:libsixel:0.16.1
Saitoha » Libsixel » Version: 0.17.0

cpe:2.3:a:saitoha:libsixel:0.17.0
Saitoha » Libsixel » Version: 0.17.1

cpe:2.3:a:saitoha:libsixel:0.17.1
Saitoha » Libsixel » Version: 0.17.2

cpe:2.3:a:saitoha:libsixel:0.17.2
Saitoha » Libsixel » Version: 0.18.0

cpe:2.3:a:saitoha:libsixel:0.18.0
Saitoha » Libsixel » Version: 0.19.0

cpe:2.3:a:saitoha:libsixel:0.19.0
Saitoha » Libsixel » Version: 0.19.1

cpe:2.3:a:saitoha:libsixel:0.19.1
Saitoha » Libsixel » Version: 0.19.2

cpe:2.3:a:saitoha:libsixel:0.19.2
Saitoha » Libsixel » Version: 0.19.3

cpe:2.3:a:saitoha:libsixel:0.19.3
Saitoha » Libsixel » Version: 0.19.4

cpe:2.3:a:saitoha:libsixel:0.19.4
Saitoha » Libsixel » Version: 0.19.5

cpe:2.3:a:saitoha:libsixel:0.19.5
Saitoha » Libsixel » Version: 0.19.6

cpe:2.3:a:saitoha:libsixel:0.19.6
Saitoha » Libsixel » Version: 0.20.0

cpe:2.3:a:saitoha:libsixel:0.20.0
Saitoha » Libsixel » Version: 0.21.0

cpe:2.3:a:saitoha:libsixel:0.21.0
Saitoha » Libsixel » Version: 0.21.1

cpe:2.3:a:saitoha:libsixel:0.21.1
Saitoha » Libsixel » Version: 0.22.0

cpe:2.3:a:saitoha:libsixel:0.22.0
Saitoha » Libsixel » Version: 0.22.1

cpe:2.3:a:saitoha:libsixel:0.22.1
Saitoha » Libsixel » Version: 0.22.2

cpe:2.3:a:saitoha:libsixel:0.22.2
Saitoha » Libsixel » Version: 0.22.3

cpe:2.3:a:saitoha:libsixel:0.22.3
Saitoha » Libsixel » Version: 0.23.0

cpe:2.3:a:saitoha:libsixel:0.23.0
Saitoha » Libsixel » Version: 0.23.1

cpe:2.3:a:saitoha:libsixel:0.23.1
Saitoha » Libsixel » Version: 0.23.2

cpe:2.3:a:saitoha:libsixel:0.23.2
Saitoha » Libsixel » Version: 0.24.0

cpe:2.3:a:saitoha:libsixel:0.24.0
Saitoha » Libsixel » Version: 0.24.2

cpe:2.3:a:saitoha:libsixel:0.24.2
Saitoha » Libsixel » Version: 0.25.0

cpe:2.3:a:saitoha:libsixel:0.25.0
Saitoha » Libsixel » Version: 0.25.1

cpe:2.3:a:saitoha:libsixel:0.25.1
Saitoha » Libsixel » Version: 0.25.2

cpe:2.3:a:saitoha:libsixel:0.25.2
Saitoha » Libsixel » Version: 0.25.3

cpe:2.3:a:saitoha:libsixel:0.25.3
Saitoha » Libsixel » Version: 0.25.4

cpe:2.3:a:saitoha:libsixel:0.25.4
Saitoha » Libsixel » Version: 0.25.5

cpe:2.3:a:saitoha:libsixel:0.25.5
Saitoha » Libsixel » Version: 0.26.0

cpe:2.3:a:saitoha:libsixel:0.26.0
Saitoha » Libsixel » Version: 0.27.0

cpe:2.3:a:saitoha:libsixel:0.27.0
Saitoha » Libsixel » Version: 0.27.1

cpe:2.3:a:saitoha:libsixel:0.27.1
Saitoha » Libsixel » Version: 0.28.0

cpe:2.3:a:saitoha:libsixel:0.28.0
Saitoha » Libsixel » Version: 1.0.0

cpe:2.3:a:saitoha:libsixel:1.0.0
Saitoha » Libsixel » Version: 1.0.1

cpe:2.3:a:saitoha:libsixel:1.0.1
Saitoha » Libsixel » Version: 1.0.2

cpe:2.3:a:saitoha:libsixel:1.0.2
Saitoha » Libsixel » Version: 1.0.3

cpe:2.3:a:saitoha:libsixel:1.0.3
Saitoha » Libsixel » Version: 1.1.0

cpe:2.3:a:saitoha:libsixel:1.1.0
Saitoha » Libsixel » Version: 1.1.1

cpe:2.3:a:saitoha:libsixel:1.1.1
Saitoha » Libsixel » Version: 1.1.2

cpe:2.3:a:saitoha:libsixel:1.1.2
Saitoha » Libsixel » Version: 1.1.3

cpe:2.3:a:saitoha:libsixel:1.1.3
Saitoha » Libsixel » Version: 1.1.4

cpe:2.3:a:saitoha:libsixel:1.1.4
Saitoha » Libsixel » Version: 1.1.5

cpe:2.3:a:saitoha:libsixel:1.1.5
Saitoha » Libsixel » Version: 1.2.0

cpe:2.3:a:saitoha:libsixel:1.2.0
Saitoha » Libsixel » Version: 1.2.1

cpe:2.3:a:saitoha:libsixel:1.2.1
Saitoha » Libsixel » Version: 1.2.2

cpe:2.3:a:saitoha:libsixel:1.2.2
Saitoha » Libsixel » Version: 1.2.3

cpe:2.3:a:saitoha:libsixel:1.2.3
Saitoha » Libsixel » Version: 1.3.0

cpe:2.3:a:saitoha:libsixel:1.3.0
Saitoha » Libsixel » Version: 1.3.1

cpe:2.3:a:saitoha:libsixel:1.3.1
Saitoha » Libsixel » Version: 1.3.2

cpe:2.3:a:saitoha:libsixel:1.3.2
Saitoha » Libsixel » Version: 1.3.3

cpe:2.3:a:saitoha:libsixel:1.3.3
Saitoha » Libsixel » Version: 1.3.4

cpe:2.3:a:saitoha:libsixel:1.3.4
Saitoha » Libsixel » Version: 1.3.5

cpe:2.3:a:saitoha:libsixel:1.3.5
Saitoha » Libsixel » Version: 1.3.6

cpe:2.3:a:saitoha:libsixel:1.3.6
Saitoha » Libsixel » Version: 1.4.0

cpe:2.3:a:saitoha:libsixel:1.4.0
Saitoha » Libsixel » Version: 1.4.1

cpe:2.3:a:saitoha:libsixel:1.4.1
Saitoha » Libsixel » Version: 1.4.10

cpe:2.3:a:saitoha:libsixel:1.4.10
Saitoha » Libsixel » Version: 1.4.11

cpe:2.3:a:saitoha:libsixel:1.4.11
Saitoha » Libsixel » Version: 1.4.12

cpe:2.3:a:saitoha:libsixel:1.4.12
Saitoha » Libsixel » Version: 1.4.13

cpe:2.3:a:saitoha:libsixel:1.4.13
Saitoha » Libsixel » Version: 1.4.2

cpe:2.3:a:saitoha:libsixel:1.4.2
Saitoha » Libsixel » Version: 1.4.3

cpe:2.3:a:saitoha:libsixel:1.4.3
Saitoha » Libsixel » Version: 1.4.4

cpe:2.3:a:saitoha:libsixel:1.4.4
Saitoha » Libsixel » Version: 1.4.5

cpe:2.3:a:saitoha:libsixel:1.4.5
Saitoha » Libsixel » Version: 1.4.6

cpe:2.3:a:saitoha:libsixel:1.4.6
Saitoha » Libsixel » Version: 1.4.7

cpe:2.3:a:saitoha:libsixel:1.4.7
Saitoha » Libsixel » Version: 1.4.8

cpe:2.3:a:saitoha:libsixel:1.4.8
Saitoha » Libsixel » Version: 1.4.9

cpe:2.3:a:saitoha:libsixel:1.4.9
Saitoha » Libsixel » Version: 1.5.0

cpe:2.3:a:saitoha:libsixel:1.5.0
Saitoha » Libsixel » Version: 1.5.1

cpe:2.3:a:saitoha:libsixel:1.5.1
Saitoha » Libsixel » Version: 1.5.2

cpe:2.3:a:saitoha:libsixel:1.5.2
Saitoha » Libsixel » Version: 1.5.3

cpe:2.3:a:saitoha:libsixel:1.5.3
Saitoha » Libsixel » Version: 1.6.0

cpe:2.3:a:saitoha:libsixel:1.6.0
Saitoha » Libsixel » Version: 1.6.1

cpe:2.3:a:saitoha:libsixel:1.6.1
Saitoha » Libsixel » Version: 1.7.0

cpe:2.3:a:saitoha:libsixel:1.7.0
Saitoha » Libsixel » Version: 1.7.1

cpe:2.3:a:saitoha:libsixel:1.7.1
Saitoha » Libsixel » Version: 1.7.2

cpe:2.3:a:saitoha:libsixel:1.7.2
Saitoha » Libsixel » Version: 1.7.3

cpe:2.3:a:saitoha:libsixel:1.7.3
Saitoha » Libsixel » Version: 1.8.0

cpe:2.3:a:saitoha:libsixel:1.8.0
Saitoha » Libsixel » Version: 1.8.1

cpe:2.3:a:saitoha:libsixel:1.8.1
Saitoha » Libsixel » Version: 1.8.2

cpe:2.3:a:saitoha:libsixel:1.8.2
Saitoha » Libsixel » Version: 1.8.3

cpe:2.3:a:saitoha:libsixel:1.8.3
Saitoha » Libsixel » Version: 1.8.4

cpe:2.3:a:saitoha:libsixel:1.8.4
Saitoha » Libsixel » Version: 1.8.5

cpe:2.3:a:saitoha:libsixel:1.8.5
Saitoha » Libsixel » Version: 1.8.6

cpe:2.3:a:saitoha:libsixel:1.8.6
Saitoha » Libsixel » Version: 1.8.7

cpe:2.3:a:saitoha:libsixel:1.8.7

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-33021

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